sched_policy.cpp revision ba8a47531c5ebc5e1322088354d2114f6892f3fd
112717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn/* 2493dad966305a7fb555addd367532dd2af275a27San Mehat** Copyright 2007, The Android Open Source Project 3493dad966305a7fb555addd367532dd2af275a27San Mehat** 4b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** Licensed under the Apache License, Version 2.0 (the "License"); 5b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** you may not use this file except in compliance with the License. 6b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** You may obtain a copy of the License at 7493dad966305a7fb555addd367532dd2af275a27San Mehat** 8b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** http://www.apache.org/licenses/LICENSE-2.0 9493dad966305a7fb555addd367532dd2af275a27San Mehat** 10b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** Unless required by applicable law or agreed to in writing, software 11b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** distributed under the License is distributed on an "AS IS" BASIS, 12b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** See the License for the specific language governing permissions and 14493dad966305a7fb555addd367532dd2af275a27San Mehat** limitations under the License. 15493dad966305a7fb555addd367532dd2af275a27San Mehat*/ 16493dad966305a7fb555addd367532dd2af275a27San Mehat 17bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#define LOG_TAG "SchedPolicy" 18bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 1912717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <errno.h> 2012717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <fcntl.h> 21493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdio.h> 22493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdlib.h> 23493dad966305a7fb555addd367532dd2af275a27San Mehat#include <string.h> 2412717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <unistd.h> 2512717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn 26bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#include <cutils/sched_policy.h> 2712717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <log/log.h> 2812717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn 2912717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#define UNUSED __attribute__((__unused__)) 300384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 31bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged. 32bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Call this any place a SchedPolicy is used as an input parameter. 33bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Returns the possibly re-mapped policy. 34bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown */ 35bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownstatic inline SchedPolicy _policy(SchedPolicy p) 36bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 37bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p; 38bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 39d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 409b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 410384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 4286b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#include <pthread.h> 43e07d77e422b328f0b7e8a542e99989dab8c95dacElliott Hughes#include <sched.h> 44e07d77e422b328f0b7e8a542e99989dab8c95dacElliott Hughes#include <sys/prctl.h> 453cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 46805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat#define POLICY_DEBUG 0 47d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 48400c381835b9eed533c67a062d88af5365590f7fElliott Hughes// This prctl is only available in Android kernels. 49400c381835b9eed533c67a062d88af5365590f7fElliott Hughes#define PR_SET_TIMERSLACK_PID 41 50400c381835b9eed533c67a062d88af5365590f7fElliott Hughes 51422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi// timer slack value in nS enforced when the thread moves to background 52422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi#define TIMER_SLACK_BG 40000000 534cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos#define TIMER_SLACK_FG 50000 54422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 55e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 56e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 57c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 58c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 59e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 60e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 6110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int fg_cgroup_fd = -1; 62e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 63919bb66f73c679cf81efc6d2433ad75197891ba6Elliott Hughes#ifdef USE_CPUSETS 64b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray// File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error 65b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int bg_cpuset_fd = -1; 66b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int fg_cpuset_fd = -1; 67ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int bg_schedboost_fd = -1; 68ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int fg_schedboost_fd = -1; 69919bb66f73c679cf81efc6d2433ad75197891ba6Elliott Hughes#endif 70b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 71e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 72b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int add_tid_to_cgroup(int tid, int fd) 73493dad966305a7fb555addd367532dd2af275a27San Mehat{ 74e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 75b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd); 76b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 77493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 78805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 79493dad966305a7fb555addd367532dd2af275a27San Mehat 80253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 81253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 82253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 83253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 84253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 85253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 86253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 87253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 88253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 89253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 90253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 91e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 92e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 93e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 94e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 95e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 96e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 97b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n", 98b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray ptr, strerror(errno), fd); 99b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 100493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 101493dad966305a7fb555addd367532dd2af275a27San Mehat } 102493dad966305a7fb555addd367532dd2af275a27San Mehat 103493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 104493dad966305a7fb555addd367532dd2af275a27San Mehat} 105493dad966305a7fb555addd367532dd2af275a27San Mehat 106e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 107e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 108e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 109e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 110e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1125b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 11310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 114e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 116e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 117522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews filename = "/dev/cpuctl/bg_non_interactive/tasks"; 1185b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 119e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 120e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 121493dad966305a7fb555addd367532dd2af275a27San Mehat } 122e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 123e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 124493dad966305a7fb555addd367532dd2af275a27San Mehat } 125b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 126b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifdef USE_CPUSETS 127b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (!access("/dev/cpuset/tasks", F_OK)) { 128b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 129b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/foreground/tasks"; 130b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 131b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/background/tasks"; 132b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 133ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#ifdef USE_SCHEDBOOST 134ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos filename = "/sys/fs/cgroup/stune/foreground/tasks"; 135ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 136ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos filename = "/sys/fs/cgroup/stune/tasks"; 137ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 138ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#endif 139b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 140b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 141b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 142c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 143c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 144c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 145c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 146c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 147503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 148c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 149503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 150c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 151c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 152c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 153c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 154c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 155c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 156c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 1579b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 158c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 159503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 160503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 161c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 162c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 163503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 164c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 165c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 166c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 167503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 168503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 169503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 170503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 171503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 172c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 173503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 174503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 175503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 176503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 177c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 180503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat 182503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 183503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 186503df2075991cd03ddf43d14e05768a2138b9028San Mehat 187503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 189503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 190503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 191503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 193503df2075991cd03ddf43d14e05768a2138b9028San Mehat 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 195503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 201c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 202c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2037e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 204503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 205503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 206503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2077e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 209503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 210c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 211c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 212c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 213c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 214c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 215c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 216c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 217c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 21869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 21969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 22069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 221e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 222c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 223c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 224c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 225c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 226c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 227c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 22810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 229522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews } else if (!strcmp(grpBuf, "bg_non_interactive")) { 230522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews *policy = SP_BACKGROUND; 231c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 232c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 233c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 234c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 236c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 237c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 238c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 239c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 240c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 241c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 242c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 243c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 244c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 245c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 246c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 247c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 248c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 249c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 250c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 251b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murrayint set_cpuset_policy(int tid, SchedPolicy policy) 252b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray{ 253b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // in the absence of cpusets, use the old sched policy 254b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifndef USE_CPUSETS 255b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return set_sched_policy(tid, policy); 256b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#else 257b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (tid == 0) { 258b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray tid = gettid(); 259b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 260b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray policy = _policy(policy); 261b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray pthread_once(&the_once, __initialize); 262b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 263b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray int fd; 264ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos int boost_fd; 265b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 266b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 267b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cpuset_fd; 268ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = bg_schedboost_fd; 269b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 270b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 271b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 272b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 273b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cpuset_fd; 274ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fg_schedboost_fd; 275b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 276b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 277ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fd = -1; 278b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 279b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 280b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 281b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 282b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (errno != ESRCH && errno != ENOENT) 283b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return -errno; 284b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 285b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 286ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 287ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (errno != ESRCH && errno != ENOENT) 288ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos return -errno; 289ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos } 290ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos 291999102664c4aa752d7e90c7c5ec5da9e1d648ac9Tim Murray return 0; 292b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 293b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray} 294b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 295c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 296c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 29769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 29869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 29969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 30069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 301e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 302493dad966305a7fb555addd367532dd2af275a27San Mehat 303d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 304d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 305d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 306d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 307d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 308d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 309d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 310d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 311d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 312d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 313d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 314d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 315d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 316d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 317d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 318d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 319d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 320d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 321d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 322d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 323d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 324d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 325d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 32610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 32710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3287e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 32910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 33129319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 33229319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3337e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 33410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 33610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 33710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3397e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 34010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 341d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 342d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 343d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 344493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 345b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray int fd; 346b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 347b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 348b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cgroup_fd; 349b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 350b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 351b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 352b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 353b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cgroup_fd; 354b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 355b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 356b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = -1; 357b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 358b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 359b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 360b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 361b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 362493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 363493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 364493dad966305a7fb555addd367532dd2af275a27San Mehat } 365493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 366493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 367493dad966305a7fb555addd367532dd2af275a27San Mehat 368493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 369493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 370493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 371b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SCHED_BATCH : SCHED_NORMAL, 372493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 373493dad966305a7fb555addd367532dd2af275a27San Mehat } 374493dad966305a7fb555addd367532dd2af275a27San Mehat 3754cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos prctl(PR_SET_TIMERSLACK_PID, 3764cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG, tid); 377422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 378493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 379493dad966305a7fb555addd367532dd2af275a27San Mehat} 3800384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 381bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 382bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 383bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 384bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 38512717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) 386bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 387bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 388bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 389bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 39012717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint get_sched_policy(int tid UNUSED, SchedPolicy *policy) 391bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 392bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 393bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 394bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 395bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 396bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 397bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 39886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 39986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 40069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 40186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 40286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 40386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 40410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 40510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 40610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 40786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 40886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 40986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 41086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 41186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 41286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 413